26445-82-9Relevant articles and documents
Boron nitride thin fibres obtained from a new copolymer borazine-tri(methylamino)borazine precursor
Duriez, Christophe,Framery, Eric,Toury, Bérangère,Toutois, Pascaline,Miele, Philippe,Vaultier, Michel,Bonnetot, Bernard
, p. 107 - 114 (2002)
Boron nitride thin fibres have been obtained using the melt drawn technique from a new molecular precursor prepared by reacting borazine (HBNH)3 with trimethylamino-borazine (CH3NHBNH)3, (MAB). Borazine reacted very slowly
Contribution to the Chemistry of Boron, 241[1] Improved Synthesis of 2,4,6-Trichloroborazine
N?th, Heinrich,Sachdev, Hermann
, p. 1345 - 1348 (1997)
2,4,6-Trichloroborazine is an important starting material for the preparation of many borazine derivatives, particularly for the parent borazine (HB=NH)3. Both are precursors for the CVD of boron nitride. Improved conditions for the synthesis o
Construction of activated carbon-supported B3N3doped carbon as metal-free catalyst for dehydrochlorination of 1,2-dichloroethane to produce vinyl chloride
Chen, Chen,Shen, Zhaobing,Zhu, Yaping,Wang, Fan,Jiang, Biao,Qi, Huimin
, p. 183 - 191 (2020)
Dehydrochlorination of 1,2-dichloroethane (1,2-DCE) is an important oil-based way for the industrial production of vinyl chloride monomer (VCM), but has proved to be plagued by a high operating temperature and low efficiency. Therefore, environmentally friendly and metal-free catalysts are in high demand for green chemical processes. In view of the stronger electronegativity of borazine (B3N3) and convenience of constructing a two-dimensional structure because of the coplanarity of B3N3, the acetenyl group, and the benzene ring, herein, we report a novel controllable B3N3doped activated carbon (B,N-ACs) synthesized using B3N3-containing arylacetylene resin for dehydrochlorination of 1,2-DCE. The result is activated carbon loaded with B3N3-doped carbon nanosheets on the surface due to the B3N3-containing arylacetylene resin grown on the surface of activated carbons. The B,N-ACs deliver excellent catalytic performance, with a 1,2-DCE conversion of ～92.0% and VCM selectivity over 99.9% at 250 °C, significantly higher than that of the current catalysts in the industry. The results further verified that pyridinic-N and the internal B3N3play significant roles in this catalysis. The new green, metal-free B,N-ACs with excellent catalytic efficiency make it a promising catalyst for dehydrochlorination of 1,2-DCE to produce VCM.
Inorganic Triphenylphosphine
Gorman, Adam D.,Bailey, Jonathan A.,Fey, Natalie,Young, Tom A.,Sparkes, Hazel A.,Pringle, Paul G.
supporting information, p. 15802 - 15806 (2018/11/23)
A completely inorganic version of one of the most famous organophosphorus compounds, triphenylphosphine, has been prepared. A comparison of the crystal structures of inorganic triphenylphosphine, PBaz3 (where Baz=B3H2N3H3) and PPh3 shows that they have superficial similarities and furthermore, the Lewis basicities of the two compounds are remarkably similar. However, their oxygenation and hydrolysis reactions are starkly different. PBaz3 reacts quantitatively with water to give PH3 and with the oxidizing agent ONMe3 to give the triply-O-inserted product P(OBaz)3, an inorganic version of triphenyl phosphite; a corresponding transformation with PPh3 is inconceivable. Thermodynamically, what drives these striking differences in the chemistry of PBaz3 and PPh3 is the great strength of the B?O bond.
A self-contained regeneration scheme for spent ammonia borane based on the catalytic hydrodechlorination of BCl3
Reller, Christian,Mertens, Florian O.R.L.
supporting information, p. 11731 - 11735 (2013/01/15)
Recycling: A self-contained procedure for the recycling of BNH-waste, based on the three major steps: polymer break-up, amine supported catalytic hydrodehalogenation of boron halogens, and the base exchange in borane amine adducts, is developed (see picture). Beyond the original task of recycling spent ammonia borane, the process provides a new means to produce borohydride species efficiently, by the direct use of molecular hydrogen. Copyright
Micrometric BN powders used as catalyst support: Influence of the precursor on the properties of the BN ceramic
Perdigon-Melon, Jose Antonio,Auroux, Aline,Guimon, Claude,Bonnetot, Bernard
, p. 609 - 615 (2008/10/09)
Thin powders and foams of boron nitride have been prepared from molecular precursors for use as noble metal supports in the catalytic conversion of methane. Different precursors originating from borazines have been tested. The best results were obtained using a precursor derived from trichloroborazine (TCB) which, after reacting with ammonia at room temperature and then thermolyzing up to 1800°C, led to BN powders with a specific area of more than 300m2g-1 and a micrometric spherical texture. Comparable results were obtained using polyborazylene under similar conditions. Aminoborazine-derived precursors did not yield such high specific area ceramics but the BN microstructure resembled a foam with a crystallized skin and amorphous internal part. These differences were related to the chemical mechanism of the conversion of the precursor into BN. Polyhaloborazines and polyborazines yielded BN through gas-solid reactions whereas aminoborazine polymers could be kept waxy up to high temperatures, which favored the glassy foam. Catalysts composed of BN support and platinum have been prepared using two routes: from a mixture of precursor or by impregnation of a BN powder leading to very different catalysts.
Porous boron nitride supports obtained from molecular precursors. Influence of the precursor formulation and of the thermal treatment on the properties of the BN ceramic
Perdigon-Melon, José Antiono,Auroux, Aline,Cornu, David,Miele, Philippe,Toury, Bérangère,Bonnetot, Bernard
, p. 98 - 106 (2007/10/03)
Boron nitride (BN) porous samples have been prepared in order to be used as noble metal catalyst support from various molecular precursors, using classical thermal methods to expand and preceramise the precursors. Three types of precursors have been teste
Preparation, Spectra and X-Ray Structure of an Archetypal Coordination Compound and its Thermolysis
Avent, Anthony G.,Hitchcock, Peter B.,Lappert, Michael F.,Liu, Dian-Sheng,Mignani, Gerard,et al.
, p. 855 - 856 (2007/10/02)
Crystalline 1 is obtained in low yield from Cl and BCl3 in toluene, with trichloroborazine (BClNH)3 2 as the principal product; detailed NMR spectroscopic data on 1 in CDCl3 are consistent with the X-ray structure, which shows intermolecular hydrogen bonding with four molecules in the unit cell av 2.76(3) Angstroem>, B-N 1.579(4), (B-Cl)av 1.837(4) and (N-H)av 0.86(5) Angstroem, with the boron and nitrogen environments approximately tetrahedral; thermolysis of 1 yields 2 and a TGA experiment shows that at 450 deg C boron nitride is the ultimate product.
Studies on 1-Trimethylsilyl-2,4,6-triethylborazine and Related Species
Niedenzu, Kurt,Serwatowska, Joanne,Serwatowski, Janusz
, p. 713 - 717 (2007/10/02)
Key Words: Boron-Nitrogen Compounds, Borazines, Unsymmetrically Substituted Borazines, Polyborazines The unsymmetrically substituted borazine (C6H5)3B3N3H2 has been obtained from the reaction of C6H5BCl2 with HN2, and an improved synthesis of (C2H5)3B3N3H2 has been developed.The reaction of the latter with an excess of BCl3 proceeds with the ultimate formation of Cl3B3N3H2, whereas the reaction with one molar equivalent of BBr3 leads to the formation of Br(C2H5)2B3N3H2a diborazinyl and additional products.C6H5BBr2 reacts with N3 to give the aminoborane 2NBBr(C6H5), but C6H5BCl2 does not undergo a reaction under analogous conditions.
Preparation of unsymmetrically B-substituted borazines and characterization of tris(4,6-diethylborazin-2-yl)amine
Bai,Niedenzu,Serwatowska,Serwatowski
, p. 4631 - 4635 (2008/10/08)
Symmetrically substituted B,B′,B″-triorganylborazines, (RBNR′)3, react with an equimolar quantity of boron trihalide, BX3 (X = Cl, Br), to form B-monohaloborazines, XR2B2N3R3, as well as RBX2, and with 2 molar equiv of BX3 to form the B,B′-dihaloborazines, X2RB3N3R′3. The compounds are obtained in good yield and purity, and are easily converted to other unsymmetrically B-substituted borazines. The borazines X(CH3)2B3N3(CH3) 3 (X = SCH3, NH2, C4H9, N[Si(CH3)2]), X(C2H5)2B3N3H3 (X = Br, SCH3), Cl(C2H5)2B3N3(CH 3)3, X2(C2H5)2B3N 3H3 (X = Br, SCH3), Cl(C6H5)2B3N3H 3, and Cl2(C2H5)B3N3(CH 3)3 have been prepared and characterized. The compound (H2N)(C2H5)2B3N 3H3 could not be obtained in the pure state; instead, it slowly condenses (even at room temperature) with the formation of the bis(borazin-2-yl)amine HN[(C2H5)2B3N3H 3]2 and the tris(borazin-2-yl)amine N[(C2H5)2B3N3H 3]3. The borazine (H2N)(CH3)2B3N3(CH 3)3 condenses at temperatures from 250 to 270°C to give HN [(CH3)2B3N3(CH3) 3]2. Reaction of this bis(borazin-2-yl)amine with LiC4H9 yields (C4H9)(CH3)2B3N 3(CH3)3 and (NHLi)(CH3)2B3N3(CH 3)3; the latter then reacts with Cl(CH3)2B3N3(CH3) 3 to regenerate HN[(CH3)2B3N3(CH3) 3]2. The unsymmetricaliy N-substituted borazine (C2H5)3B3N3H 2[Si(CH3)3] has been isolated and characterized.
